Hi folks,
I have a sophisticated question for which I can't find any hints on the web:
If you configure init (via /etc/inittab) to respawn processes (like the getty processes) when they exit - how often does init check for the existence of such a process? Does it check actively at all or does it rely on some kind of inter process communication?
I am not a programmer, so maybe the second question is completely nonsense. Any hint or help is appreciated.
Dirk
On 2009-07-07, at 6:17 AM, "Dirk H. Schulz" dirk.schulz@kinzesberg.de wrote:
Hi folks,
I have a sophisticated question for which I can't find any hints on the web:
If you configure init (via /etc/inittab) to respawn processes (like the getty processes) when they exit - how often does init check for the existence of such a process? Does it check actively at all or does it rely on some kind of inter process communication?
I'd imagine it uses wait (man 2 wait) and/or waits for a SIGCHLD to be sent. The latter sent to it whenever a child process exits.
In either case, the spawned process does not need to be aware of how knit works under the hood.
HTH Michael
-
Dirk H. Schulz -
Michael Kralka